package com.fzl.spring_chatroom.utils;

import org.springframework.util.DigestUtils;
import org.springframework.util.StringUtils;

import java.nio.charset.StandardCharsets;
import java.util.UUID;

public class SecurityUtil {
    /**
     * 加密
     * md5(salt+明文)
     *
     * @return 盐值 + md5(盐值+明文)
     */
    public static String encrypt(String password) {
        String salt = UUID.randomUUID().toString().replace("-", "");
        String securityPassword = DigestUtils.md5DigestAsHex((salt + password).getBytes(StandardCharsets.UTF_8));
        return salt + securityPassword;
    }

    /**
     * 验证
     * 数据库存储的是  盐值 + md5(盐值+明文)
     *
     * @return
     */
    public static boolean verify(String inputPassword, String sqlPassword) {
        if (!StringUtils.hasLength(inputPassword)) {
            return false;
        }
        if (sqlPassword == null || sqlPassword.length() != 64) {
            return false;
        }
        String salt = sqlPassword.substring(0, 32);
        String securityPassword = DigestUtils.md5DigestAsHex((salt + inputPassword).getBytes(StandardCharsets.UTF_8));
        return sqlPassword.equals(salt + securityPassword);
    }
}
